Formwork, also known as shuttering, is a temporary structure used as a mould to pour the concrete. It is a vertical or horizontal arrangement made to keep concrete in position until the same gains strength shape. It should be strong enough to withstand different forms of loads such as dead load of green concrete, live load due to working labour, Impact effect at the time of pouring concrete, compacting concrete by mechanical equipment (vibrator, needle vibrator, plate vibrator and so on). It should be leakage proof, waterproof and rigid enough to avoid deflection. The materials used for making formwork should resist warping, bulking, and weathering.
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